Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
MATCHBOX “ELEVATOR”
Matches... How many times we use them for the day! To do this, constantly having to open and close the drawer or get them off the shelf — they are thrown on the table — the baby was right...
NEITHER OF PELINCE, NOT A SPECK OF DUST
To save yourself from cleaning sawdust, dust after drilling in the wall, before beginning work, secure the paper on the sticky tape just below future openings.
